4- Calculate E°cell for the following redox reaction. Zn2+ (aq) + Sn2+ (aq) → Zn (s) + Sn4+ (aq)
5- A student provides a current of 2.50 amps through a solution of CaCl2 (aq) for 4.50 hours. The voltage is such that calcium metal is deposited at the cathode. What is the mass of calcium deposited?
6- What is the cell potential for the reaction Mg(s)+Fe 2+ (aq)→Mg 2+ (aq)+Fe(s) at 67 ∘ C when [Fe 2+ ]= 3.80M and [Mg 2+ ]= 0.310M.Express your answer to three significant figures and include the appropriate units.

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Recent Feedback

"Thankyou for the feedback.
I have a few question though;
With the first statistic about cost below...
“According to Sigma-Aldrich catalog, cost of 1L octane is AUD $ 392.00, whereas the cost of 1L ethanol is AUD $196.00. Moreover, if ethanol is obtained from sugar industry as a by-product, it may cost even less. Source of oxygen is ambient atmosphere, so it costs nothing. So ethanol is much cheaper than petrol, in fact it is half-priced: AUD $ (392-196) = $ 196.”
I didn't think it made sense because the cost of petrol per litre is normally a dollar something or even less than a dollar not a couple of hundred of dollars. For example, a statistic that I found in america was:
"U.S. ethanol production costs are about $1.20 per gallon of ethanol, or $1.82 per gallon on a gasoline-equivalent basis."
However, I was wondering whether you could find an Australian statistic.
Also, you mentioned that H20 is not a greenhouse gas. However, in the combustion equations it is actually carbon dioxide and water vapour which are produced and they are both greenhouse gases.
Finally, how do I calculate the energy efficiency of ethanol and petrol?
"

"Thank you!"

"Didnt really answer my questions but gave me a start at least."

"Once again this is tremendous help I can't thank you enough for not only working the problem but explaining in detail how and why!!
KR"